VITE AUTOFORMANTE PER PLASTICA E SIMILARI MATERIALI, INCLUSI METALLI TENERI, CON ELEVATA RESISTENZA ALLO STRAPPO E MINIMA COPPIA DI AVVITAMENTO

摘要

The invention relates to a self-threading screw having a thread wit a thread angle not greater than 25 DEG and an angle between the thread front portion (1) and the screw stem (2) of 90 DEG or a value as far as possible near to 90 DEG .